In English, we have the interrobang -- ‽ (often represented by ?! or !?) -- which can express incredulity and surprise in-text. Does Spanish have an equivalent punctuation mark? If so, would it, like the exclamation point and question mark, require an antecedent at the beginning of a sentence?
This answer provides a possible answer to this question as well:
And according to Wikipedia, you can also use this form, although it is not considered standard: